I've found the solution:
let body = new FormData();
body.append('photo', {uri: imagePath,name: 'photo.png',filename :'imageName.png',type: 'image/png'});
body.append('Content-Type', 'image/png');
fetch(Url,{ method: 'POST',headers:{
"Content-Type": "multipart/form-data",
"otherHeader": "foo",
} , body :body} )
.then((res) => checkStatus(res))
.then((res) => res.json())
.then((res) => { console.log("response" +JSON.stringify(res)); })
.catch((e) => console.log(e))
.done()
** filename is optional...
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…